12 LLM observability platforms, compared attribute by attribute

EvalIndex is a reference index of the platforms teams use to trace, evaluate and monitor LLM applications. Every attribute below was assessed first-hand, and every value carries its own source URL and the date it was last checked. There are no user reviews. A listing, a rank and an assessment's outcome cannot be bought. What EvalIndex does sell — a clearly labelled vendor-authored block on a vendor's own record, and expedited assessment queue position — changes no rank, no value and no assessment; the Pricing page states it plainly.

12 LLM observability platforms, one row each, every value sourced and dated

Every value is sourced and dated; open a record for its evidence. Rows are ordered alphabetically by platform name. Price units differ per vendor — the price column is not a like-for-like comparison.